Next 3 slides -UPX-14 Interrogator Unit (Identification Friend or Foe Radar) (IFF) - one of two per site located on the FPS-27 Tower 4th floor. Used a solid state power supply (bottom drawer) and a tube Tx/Rx (Top Drawer)

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Next 3 slides -UPX-14 Interrogator Unit (Identification Friend or Foe Radar) (IFF) - one of two per site located on the FPS-27 Tower 4th floor. Used a solid state power supply (bottom drawer) and a tube Tx/Rx (Top Drawer)